How to allow member to write posts
Ultimate Member displays posts in members profiles, but there is no tool to add and edit posts in profile. WordPress has a built-in tool for publishing posts. Members can create post using WordPress posts editor on wp-admin > Posts > Add New if their user role has capabilities needed to do this. The Author (author) role has needed capabilities by default. You can grant the same capabilities to other roles to allow them publishing posts.
You can edit capabilities for roles created with Ultimate Member using the WP Capabilities tool on wp-admin > Ultimate Member > User Roles > Edit Role. Use third-party plugin User Role Editor to edit capabilities for other roles.
You also should allow members to access the WordPress dashboard. Turn on the Can access wp-admin? setting.
Members can create post using WordPress posts editor on wp-admin > Posts > Add New.
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